A. Denver had a greater dropout rate. B. any differences can be explained by sam

Question

A. Denver had a greater dropout rate.
B. any differences can be explained by sampling variability.
C.Atlanta had a greater dropout rate.

A study to compare two types of infant formula was run at two sites, one in Atlanta and the second in Denver. The study was run over a three-week period. Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study. The following table gives the number of dropouts and completers at each site. A chi-square test was performed and the result was 2 = 5.101 with P-value = 0.024.
Responder Dropout Completer Atlanta 16 134 Denver 21 379

The correct conclusion is

A. Denver had a greater dropout rate.
B. any differences can be explained by sampling variability.
C.Atlanta had a greater dropout rate.

Explanation / Answer

A study to compare two types of infant formula was run at two sites, one in Atlanta and the second in Denver. The study was run over a three-week period. Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study. The following table gives the number of dropouts and completers at each site. A chi-square test was performed and the result was 2 = 5.101 with P-value = 0.024.

Responder

Dropout

Completer

Atlanta

16

134

Denver

21

379

Atlanta dropout rate =16/150=0.1066

Denver dropout rate=21/400 = 0.0525

The dropout rates are significant, P=0.024 which is < 0.05 level.

The correct conclusion is

A. Denver had a greater dropout rate.
B. any differences can be explained by sampling variability.
C. Atlanta had a greater dropout rate.

A study to compare two types of infant formula was run at two sites, one in Atlanta and the second in Denver. The study was run over a three-week period. Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study. The following table gives the number of dropouts and completers at each site. A chi-square test was performed and the result was 2 = 5.101 with P-value = 0.024.

Responder

Dropout

Completer

Atlanta

16

134

Denver

21

379

Atlanta dropout rate =16/150=0.1066

Denver dropout rate=21/400 = 0.0525

The dropout rates are significant, P=0.024 which is < 0.05 level.

The correct conclusion is

A. Denver had a greater dropout rate.
B. any differences can be explained by sampling variability.
C. Atlanta had a greater dropout rate.

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